NuSTAR view of Active Galactic Nuclei: Probing the reflected emission

Diplôme Thèse NuSTAR view of Active Galactic Nuclei: Probing the reflected emission eng 2021-02-22 author Panagiotou Christos 863238 director Walter Roland 23812 10.13097/archive-ouverte/unige:151429 urn:nbn:ch:unige-1514292 Sc. 5547 Active Galactic Nuclei (AGN) are among the most luminous and mysterious celestial sources, thought to be powered by the accretion of matter onto a supermassive black hole. In this thesis, I investigated the hard X-ray radiation of AGN, with a main focus on the X-ray reflected emission, in order to obtain a better insight into the geometry and physics of these sources. This was achieved by studying the NuSTAR observations of a large sample of nearby AGN. Local AGN were found to feature a large range of spectral shapes above 10 keV. In unabsorbed AGN, the hard X-ray spectrum is shaped by the dynamics of the X-ray corona, while the spectrum above 10 keV of absorbed sources is shaped by the torus' characteristics. Moreover, the continuum X-ray emission was found to differ between absorbed and unabsorbed objects, which might hint the existence of intrinsic differences between the two groups. Active Galactic Nuclei AGN X-rays Seyfert Galaxies NuSTAR Dewey 520 26 Département d'astronomie 12 false 7402183a-1827-4e10-b521-23e4833d7a0d Thesis Public Thesis_CPanagiotou.pdf 7951011 application/pdf openAccess Faculté des sciences / Département d'astronomie

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Panagiotou, Christos